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Arabidopsis TCH4, regulated by hormones and the environment, encodes a xyloglucan endotransglycosylaseAdaptation of plants to environmental conditions requires that sensing of external stimuli be linked to mechanisms of morphogenesis. The Arabidopsis TCH (for touch) genes are rapidly upregulated in expression in response to environmental stimuli, but a connection between this molecular response and developmental alterations has not been established. We identified TCH4 as a xyloglucan endotransglycosylase by sequence similarity and enzyme activity. Xyloglucan endotransglycosylases most likely modify cell walls, a fundamental determinant of plant form. We determined that TCH4 expression is regulated by auxin and brassinosteroids, by environmental stimuli, and during development, by a 1-kb region. Expression was restricted to expanding tissues and organs that undergo cell wall modification. Regulation of genes encoding cell wall-modifying enzymes, such as TCH4, may underlie plant morphogenetic responses to the environment.
Document ID
20050000136
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Xu, W.
(Rice University Houston, Texas 77251-1892, United States)
Purugganan, M. M.
Polisensky, D. H.
Antosiewicz, D. M.
Fry, S. C.
Braam, J.
Date Acquired
August 22, 2013
Publication Date
October 1, 1995
Publication Information
Publication: The Plant cell
Volume: 7
Issue: 10
ISSN: 1040-4651
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: GMO7833
CONTRACT_GRANT: R29 GM46346
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Plant Biology
Non-NASA Center

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